I'm having trouble isolating what is causing IOWAIT to consume huge chunks of CPU every 30~45 seconds.  I first thought it was the new PLEX docker, then I thought it was "Folder Caching" app.  Disabling either of these allows the CPU to remain normal for a while, but later it's utilization goes up again.  Also, yesterday with the command prompt I deleted a directory (share) and that lowered the CPU utilization for a while ?!?

 

The screen grab shows the CPU during a file transfer from the cache drive to the array.  This file transfer goes a bit slower than normal.  I tried copying it twice from cache to the array and both times it slowed down and both times it wrote to a different data disk.  This makes me think I may have an issue with either the cache disk or parity disc?  

 

I am puzzled 

 

I've changed a lot on the server lately including swapping out an 8TB for a 10TB cache drive, installing NORCO 3-5 drive pods, and a few other things...

 

Attached are a screen grab and diagnostics.

 

Any help would be appreciated.

 

Thanks,

craigr

 

 

unraid-diagnostics-20190823-1906.zip

Edited August 23, 20196 yr by craigr

There’s already an open bug report. Revert to v6.6.7.

 

https://forums.unraid.net/bug-reports/stable-releases/67x-very-slow-array-concurrent-performance-r605/

Wow, thanks!

 

I hope this gets fixed soon 

 

Best,

craigr